TempStr = input("请输入带有符号的温度值")
if TempStr[-1] in ["F",'f']:
    c = (eval(TempStr[0:-1])-32)/1.8
    print("转换后的温度是{:.2f}c".format(c))
elif TempStr[-1] in ["C","c"]:
    F = 1.8*eval(TempStr[0:-1])+32
    print("转换后的温度是{:.2f}F".format(F))
else:
    print("输入格式错误")